Driving device

Abstract

A driving device includes a first one-way clutch OWC 1 provided on a power transmission path between a driving source and a driven portion which becomes in an engaged state when rotational power in one direction of the driving source side is input to the driven portion side and becomes in a disengaged state when rotational power in the other direction of the driving source side is input to the driven portion side and which becomes in a disengaged state when rotational power in one direction of the driven portion side is input to the driving source side and becomes in an engaged state when rotational power in the other direction of the driven portion side is input to the driving source side, a connection/disconnection unit which is provided in parallel with the first one-way clutch OWC 1 on the power transmission path, and a second one-way clutch OWC 2 provided in parallel with the first one-way clutch OWC 1 and in series with the connection/disconnection unit on the power transmission path which performs an operation opposite to that of the first one-way clutch OWC 1.

The invention claimed is: 
     
       1. A driving device comprising:
 a driving source; 
 a driven portion which is driven by the driving source and propels a transport apparatus; 
 a first one-way power transmission unit which is provided on a power transmission path between the driving source and the driven portion, which becomes in an engaged state when rotational power in one direction of the driving source side is input to the driven portion side and becomes in a disengaged state when rotational power in the other direction of the driving source side is input to the driven portion side, and which becomes in a disengaged state when rotational power in one direction of the driven portion side is input to the driving source side and becomes in an engaged state when rotational power in the other direction of the driven portion side is input to the driving source side; 
 a connection/disconnection unit which is provided in parallel with the first one-way power transmission unit on the power transmission path, and which sets the power transmission path to an interrupted state or a connection-permitted state by being activated or deactivated; and 
 a second one-way power transmission unit which is provided in parallel with the first one-way power transmission unit and in series with the connection/disconnection unit on the power transmission path, which becomes in a disengaged state when rotational power in one direction of the driving source side is input to the driven portion side and becomes in an engaged state when rotational power in the other direction of the driving source side is input to the driven portion side, and which becomes in an engaged state when rotational power in one direction of the driven portion side is input to the driving source side and becomes in a disengaged state when rotational power in the other direction of the driven portion side is input to the driving source side, wherein 
 the driving source includes a first electric motor driving a left wheel of a vehicle and a second electric motor driving a right wheel of the vehicle, 
 a first transmission is provided on a power transmission path between the first electric motor and the left wheel, 
 a second transmission is provided on a power transmission path between the second electric motor and the right wheel, 
 each of the first and second transmissions is constituted by first to third rotation elements, 
 the first electric motor is connected to the first rotation element of the first transmission, 
 the second electric motor is connected to the first rotation element of the second transmission, 
 the left wheel is connected to the second rotation element of the first transmission, 
 the right wheel is connected to the second rotation element of the second transmission, 
 the third rotation element of the first transmission and the third rotation element of the second transmission are connected to each other, and 
 the first one-way power transmission unit, the connection/disconnection unit, and the second one-way power transmission unit are arranged in the third rotation elements connected to each other. 
 
     
     
       2. The driving device according to  claim 1 , wherein
 the first electric motor and the first transmission are arranged in this order from a left outer side in a vehicle width direction, 
 the second electric motor and the second transmission are arranged in this order from a right outer side in the vehicle width direction, and 
 the first one-way power transmission unit, the connection/disconnection unit, and the second one-way power transmission unit are arranged between the first transmission and the second transmission in the vehicle width direction. 
 
     
     
       3. The driving device according to  claim 1 , wherein
 the first one-way power transmission unit, the connection/disconnection unit, and the second one-way power transmission unit are arranged further on an inner side than outermost diameter portions of the first transmission and the second transmission in a radial direction. 
 
     
     
       4. The driving device according to  claim 1 , wherein
 the first electric motor and the first transmission are arranged in this order from a left outer side in a vehicle width direction, 
 the second electric motor and the second transmission are arranged in this order from a right outer side in the vehicle width direction, and 
 the first one-way power transmission unit, the connection/disconnection unit, and the second one-way power transmission unit are arranged on either one side of the first transmission or the second transmission in the vehicle width direction and on a radially outer side. 
 
     
     
       5. The driving device according to  claim 4 , wherein
 the driving device includes an actuator for controlling activation or deactivation of the connection/disconnection unit, and 
 the actuator is arranged on the other side of the first transmission and the second transmission in the vehicle width direction and on the radially outer side. 
 
     
     
       6. The driving device according to  claim 5 , wherein
 at least a part of the actuator is arranged further on an inner side than an outermost diameter portion of the first transmission or the second transmission in the radial direction. 
 
     
     
       7. A driving device comprising:
 a driving source; 
 a driven portion which is driven by the driving source and propels a transport apparatus; 
 a first one-way power transmission unit which is provided on a power transmission path between the driving source and the driven portion, which becomes in an engaged state when rotational power in one direction of the driving source side is input to the driven portion side and becomes in a disengaged state when rotational power in the other direction of the driving source side is input to the driven portion side, and which becomes in a disengaged state when rotational power in one direction of the driven portion side is input to the driving source side and becomes in an engaged state when rotational power in the other direction of the driven portion side is input to the driving source side; 
 a second one-way power transmission unit which is provided in parallel with the first one-way power transmission unit on the power transmission path, which becomes in a disengaged state when rotational power in one direction of the driving source side is input to the driven portion side and becomes in an engaged state when rotational power in the other direction of the driving source side is input to the driven portion side, and which becomes in an engaged state when rotational power in one direction of the driven portion side is input to the driving source side and becomes in a disengaged state when rotational power in the other direction of the driven portion side is input to the driving source side, and 
 a switching unit which is provided in parallel with the first one-way power transmission unit and in series with the second one-way power transmission unit on the power transmission path, and which sets the second one-way power transmission unit to an effective state or an ineffective state by being switched between a first state and a second state, wherein 
 the driving source includes a first electric motor driving a left wheel of a vehicle and a second electric motor driving a right wheel of the vehicle, 
 a first transmission is provided on a power transmission path between the first electric motor and the left wheel, 
 a second transmission is provided on a power transmission path between the second electric motor and the right wheel, 
 each of the first and second transmissions is constituted by first to third rotation elements, 
 the first electric motor is connected to the first rotation element of the first transmission, 
 the second electric motor is connected to the first rotation element of the second transmission, 
 the left wheel is connected to the second rotation element of the first transmission, 
 the right wheel is connected to the second rotation element of the second transmission, 
 the third rotation element of the first transmission and the third rotation element of the second transmission are connected to each other, and 
 the first one-way power transmission unit, the second one-way power transmission unit, and the switching unit are arranged in the third rotation elements connected to each other. 
 
     
     
       8. The driving device according to  claim 7 , wherein
 the first electric motor and the first transmission are arranged in this order from a left outer side in a vehicle width direction, 
 the second electric motor and the second transmission are arranged in this order from a right outer side in the vehicle width direction, and 
 the first one-way power transmission unit, the second one-way power transmission unit, and the switching unit are arranged between the first transmission and the second transmission in the vehicle width direction. 
 
     
     
       9. The driving device according to  claim 8 , wherein
 the first one-way power transmission unit, the second one-way power transmission unit, and the switching unit are arranged further on an inner side than outermost diameter portions of the first transmission and the second transmission in a radial direction. 
 
     
     
       10. The driving device according to  claim 7 , wherein
 the first electric motor and the first transmission are arranged in this order from a left outer side in a vehicle width direction, 
 the second electric motor and the second transmission are arranged in this order from a right outer side in the vehicle width direction, and 
 the first one-way power transmission unit, the second one-way power transmission unit, and the switching unit are arranged on either one side of the first transmission or the second transmission in the vehicle width direction and on a radially outer side. 
 
     
     
       11. The driving device according to  claim 10 , wherein
 the driving device includes an actuator for controlling the first state or the second state of the switching unit, and 
 the actuator is arranged on the other side of the first transmission and the second transmission in the vehicle width direction and on the radially outer side. 
 
     
     
       12. The driving device according to  claim 11 , wherein
 at least a part of the actuator is arranged further on an inner side than an outermost diameter portion of the first transmission or the second transmission in the radial direction. 
 
     
     
       13. A driving device which includes a driving source and a wheel driven by the driving source, the driving device comprising:
 a first one-way power transmission unit which is provided on a power transmission path between the driving source and the wheel, which becomes in an engaged state when rotational power in one direction of the driving source side is input to the wheel side and becomes in a disengaged state when rotational power in the other direction of the driving source side is input to the wheel side, and which becomes in a disengaged state when rotational power in one direction of the wheel side is input to the driving source side and becomes in an engaged state when rotational power in the other direction of the wheel side is input to the driving source side; 
 a second one-way power transmission unit which is provided in parallel with the first one-way power transmission unit on the power transmission path, which becomes in a disengaged state when rotational power in one direction of the driving source side is input to the wheel side and becomes in an engaged state when rotational power in the other direction of the driving source side is input to the wheel side, and which becomes in an engaged state when rotational power in one direction of the wheel side is input to the driving source side and becomes in a disengaged state when rotational power in the other direction of the wheel side is input to the driving source side; and 
 a switching unit which is provided in parallel with the first one-way power transmission unit and in series with the second one-way power transmission unit on the power transmission path, and which sets the second one-way power transmission unit to an effective state or an ineffective state by being switched between a first state and a second state, wherein 
 the driving source includes a left electric motor driving a left wheel of a vehicle and a right electric motor driving a right wheel of the vehicle, 
 a left transmission is provided on a power transmission path between the left electric motor and the left wheel, 
 a right transmission is provided on a power transmission path between the right electric motor and the right wheel, 
 each of the left transmission and the right transmission has a sun rotating body, a ring rotating body, a planetary rotating body meshing with the sun rotating body and the ring rotating body, and a carrier rotating body which supports the planetary rotating body in a rotatable and revolvable manner, 
 the left electric motor is connected to the sun rotating body of the left transmission, 
 the right electric motor is connected to the sun rotating body of the right transmission, 
 the left wheel is connected to the carrier rotating body of the left transmission, 
 the right wheel is connected to the carrier rotating body of the right transmission, 
 the ring rotating body of the left transmission and the ring rotating body of the right transmission are connected to each other, 
 the first one-way power transmission unit, the second one-way power transmission unit, and the switching unit are arranged in the ring rotating bodies connected to each other, 
 in the ring rotating body of the left transmission, an inward flange portion extending inward in a radial direction is supported by the carrier rotating body of the left transmission, 
 in the ring rotating body of the right transmission, an inward flange portion extending inward in the radial direction is supported by the carrier rotating body of the right transmission, and 
 an abutment position where the ring rotating body of the left transmission and the ring rotating body of the right transmission directly or indirectly abut on each other is located at the substantially same diameter position as a meshing position between the ring rotating body of the left transmission and the planetary rotating body of the left transmission and a meshing position between the ring rotating body of the right transmission and the planetary rotating body of the right transmission. 
 
     
     
       14. The driving device according to  claim 13 , wherein
 a meshing portion between the ring rotating body of the left transmission and the planetary rotating body of the left transmission is formed such that a force acts on the ring rotating body of the left transmission in a direction approaching the right transmission in an axial direction when rotational power in one direction of the driving source side is input to the wheel side, and 
 a meshing portion between the ring rotating body of the right transmission and the planetary rotating body of the right transmission is formed such that a force acts on the ring rotating body of the right transmission in a direction approaching the left transmission in the axial direction when rotational power in one direction of the driving source side is input to the wheel side. 
 
     
     
       15. The driving device according to  claim 14 , wherein
 the rotational power in one direction of the driving source side is rotational power at the time of advancing the vehicle. 
 
     
     
       16. The driving device according to  claim 13 , wherein
 the left electric motor and the left transmission are arranged in this order from a left outer side in a vehicle width direction, 
 the right electric motor and the right transmission are arranged in this order from a right outer side in the vehicle width direction, and 
 the first one-way power transmission unit, the second one-way power transmission, and the switching unit are arranged on either one side of the left transmission or the right transmission in the vehicle width direction and on a radially outer side. 
 
     
     
       17. A driving device which includes a driving source and a wheel driven by the driving source, the driving device comprising:
 a first one-way power transmission unit which is provided on a power transmission path between the driving source and the wheel, which becomes in an engaged state when rotational power in one direction of the driving source side is input to the wheel side and becomes in a disengaged state when rotational power in the other direction of the driving source side is input to the wheel side, and which becomes in a disengaged state when rotational power in one direction of the wheel side is input to the driving source side and becomes in an engaged state when rotational power in the other direction of the wheel side is input to the driving source side; 
 a second one-way power transmission unit which is provided in parallel with the first one-way power transmission unit on the power transmission path, which becomes in a disengaged state when rotational power in one direction of the driving source side is input to the wheel side and becomes in an engaged state when rotational power in the other direction of the driving source side is input to the wheel side, and which becomes in an engaged state when rotational power in one direction of the wheel side is input to the driving source side and becomes in a disengaged state when rotational power in the other direction of the wheel side is input to the driving source side; and 
 a switching unit which is provided in parallel with the first one-way power transmission unit and in series with the second one-way power transmission unit on the power transmission path and sets the second one-way power transmission unit to an effective state or an ineffective state by being switched between a first state and a second state, wherein 
 the driving source includes a left electric motor driving a left wheel of a vehicle and a right electric motor driving a right wheel of the vehicle, 
 a left transmission is provided on a power transmission path between the left electric motor and the left wheel, 
 a right transmission is provided on a power transmission path between the right electric motor and the right wheel, 
 each of the left transmission and the right transmission has a sun rotating body, a ring rotating body, a planetary rotating body meshing with the sun rotating body and the ring rotating body, and a carrier rotating body which supports the planetary rotating body in a rotatable and revolvable manner, 
 the left electric motor is connected to the sun rotating body of the left transmission, 
 the right electric motor is connected to the sun rotating body of the right transmission, 
 the left wheel is connected to the carrier rotating body of the left transmission, 
 the right wheel is connected to the carrier rotating body of the right transmission, 
 the ring rotating body of the left transmission and the ring rotating body of the right transmission are connected to each other via a connecting member fitted from an outer diameter side, 
 the first one-way power transmission unit, the second one-way power transmission unit, and the switching unit are arranged in the ring rotating bodies connected to each other, 
 an oil reservoir for storing lubricating oil is provided above the connecting member, and 
 the connecting member is provided with a through hole passing through an inner circumferential surface and an outer circumferential surface. 
 
     
     
       18. The driving device according to  claim 17 , wherein
 a ring spline portion is provided on an outer circumferential surface of the ring rotating body of the left transmission, 
 a ring spline portion is provided on an outer circumferential surface of the ring rotating body of the right transmission, 
 in the connecting member, a connecting spline portion fitted to the ring spline portions of the ring rotating bodies of the left transmission and the right transmission is provided on the inner circumferential surface, and 
 the through hole is disposed between the ring spline portion provided in the ring rotating body of the left transmission and the ring spline portion provided in the ring rotating body of the right transmission. 
 
     
     
       19. The driving device according to  claim 18 , wherein
 the connecting spline portion has 
 a left connecting spline portion fitted to the ring spline portion provided in the ring rotating body of the left transmission, 
 a right connecting spline portion fitted to the ring spline portion provided in the ring rotating body of the right transmission, and 
 an annular groove accommodating a circlip disposed between the left connecting spline portion and the right connecting spline portion, and 
 the through hole is provided in the annular groove. 
 
     
     
       20. The driving device according to  claim 19 , wherein
 a predetermined gap is provided in a radial direction between the circlip and the through hole. 
 
     
     
       21. The driving device according to  claim 19 , wherein
 a plurality of the through holes are provided in a circumferential direction, and 
 a recessed groove connecting the plurality of the through holes is provided on the outer circumferential surface of the connecting member. 
 
     
     
       22. The driving device according to  claim 17 , wherein
 an abutment position where the ring rotating body of the left transmission and the ring rotating body of the right transmission directly or indirectly abut on each other is located at the substantially same diameter position as a meshing position between the ring rotating body of the left transmission and the planetary rotating body of the left transmission and a meshing position between the ring rotating body of the right transmission and the planetary rotating body of the right transmission. 
 
     
     
       23. The driving device according to  claim 17 , wherein
 the driving device further comprises an actuator for controlling an effective state or an ineffective state of the switching unit, 
 the first one-way power transmission unit, the switching unit, and the second one-way power transmission unit are arranged on either one side of the ring rotating bodies connected to each other and on an outer diameter side, 
 the actuator is disposed on the other side of the ring rotating bodies connected to each other and on the outer diameter side, and 
 the oil reservoir is integrally formed with an actuator holding portion for holding the actuator.